Scrambled Screen - PC Freezes

Friends,

I have an ASUS M2N-MX SE motherboard with AMD Athlon X2 64 4000+ CPU

My Graphics Card chip type is NVIDIA GeForce 6150SE nForce 430

Now, of late I am having this weird problem, the problem is that in the middle of normal PC operations [such as browsing websites] my screen just scrambles up and the PC freezes.

The screen appears to be like this

http://media.photobucket.com/image/...ns/ABCD0001.jpg

Once this happens, the only solution for me is to reset my PC and on resuming it happens again.

I remember having this problem once about a year back, later I updated the display drivers from NVIDIA and it was running fine until today when this problem started again....and now it's much more frequent.

Kindly advise.


Thanks!